tailieunhanh - Photosynthetic efficiency and quantitative reaction of bread winter wheat to mild short-term drought conditions

The effect of water reduction stress on photosynthetic efficiency and the agronomic traits of 10 bread winter wheat cultivars were investigated, with an aim to develop breeding methods for improving wheat drought tolerance. In the 2008 and 2009 crop seasons, the trial was grown in vegetative pots according to the method of a 2-factorial experiment (cultivar and treatment) as a randomized complete block with 3 replications. | Turkish Journal of Agriculture and Forestry Research Article Turk J Agric For (2013) 37: 385-393 © TÜBİTAK doi: Photosynthetic efficiency and quantitative reaction of bread winter wheat to mild short-term drought conditions 1, 1 2 1 1 1 Josip KOVAČEVIĆ *, Maja KOVAČEVIĆ , Vera CESAR , Georg DREZNER , Alojzije LALIĆ , Hrvoje LEPEDUŠ , 1 1 1 2 3 Zvonimir ZDUNIĆ , Zorica JURKOVIĆ , Krešimir DVOJKOVIĆ , Zorana KATANIĆ , Vlado KOVAČEVIĆ 1 Agricultural Institute Osijek, Osijek, Croatia 2 Department of Biology, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia 3 Faculty of Agriculture in Osijek, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia Received: Accepted: Published Online: Printed: Abstract: The effect of water reduction stress on photosynthetic efficiency and the agronomic traits of 10 bread winter wheat cultivars were investigated, with an aim to develop breeding methods for improving wheat drought tolerance. In the 2008 and 2009 crop seasons, the trial was grown in vegetative pots according to the method of a 2-factorial experiment (cultivar and treatment) as a randomized complete block with 3 replications. The stressed version of the treatment was exposed to mild water reduction short-term stress 3 times (at the end of tillering stage, at the flag leaf to beginning of heading stage, and at the grain filling stage). Three photosynthetic efficiency parameters (Fv/Fm, ET0/ABS, and PIABS) were investigated at the end of the tillering stage (water content of soil: – volume for the stressed variant and – volume for the control), and 6 agronomic traits were estimated before and after winter wheat harvest. Significant differences were detected among cultivars for all investigated traits. The investigation revealed that water reduction stress decreased all examined agronomic traits. However, photosynthetic

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